MATLAB is not just a statistical package, but a numerical computing environment that offers much more flexibility than pure statistical softwares, especially for more advanced analysis. It's not a drag-from-menu-bar application, and you need to learn the MATLAB programming language. MATLAB is more used in field of science and engineering, however, the statistics toolbox and econometrics toolbox are very powerful and useful for social science data analysis too.
Where to Find MATLAB?
MATLAB is installed on on the computers in the East Wing of Geisel Library and in some ETS labs.
Free open tutorials online, ordered by level of proficiency.